sudo ip tuntap add dev tap0 mode tap
sudo ip addr add 192.168.200.1/24 dev tap0

sudo ip route | grep tap0
192.168.200.0/24 dev tap0 proto kernel scope link src 192.168.200.1 linkdown

Useful:
sudo ip link set tap0 up
sudo ip route add 192.168.200.0/24 dev tap0 src 192.168.200.1